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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Diastolic Pressure (Definition) Diastolic pressure is essentially the pressure in the blood vessels in between beats when the heart is filling for the next beat, or the resting pressure. On a blood pressure meter it is the bottom number, with normal for most patients being less than 85mmhg. ...Read more.